A light source apparatus is capable of supplying white light including a predetermined wavelength band and a special light, which is light including the predetermined wavelength band and narrower in a band than the white light. The light source apparatus includes a first light source configured to emit light in a first wavelength band including the predetermined wavelength band, a second light source configured to emit light in a second wavelength band including the predetermined wavelength band, an optical member configured to extract light in the predetermined wavelength band from one light of the lights in the first and second wavelength bands, extract light in a third wavelength band other than the predetermined wavelength band from the other light of the lights in the first and second wavelength bands, and mix and emit the light in the predetermined wavelength band and the light in the third wavelength band, and a control section configured to, when the white light is supplied, cause the first and second light sources to simultaneously emit lights and, when the special light is supplied, set a light amount ratio of the first and second light sources to a ratio different from a ratio at the time when the white light is supplied.
